shows president obama leading among swing state voters. 52% of likely voters in battleground states say they would vote for the president if the election were today. 41% say they woo pick mr. romney. those numbers are similar from the washington post polls, in florida, ohio and virginia. >> developing overseas tonight, a grim milestone in the war in afghanistan. the death toll for u.s. troops has now reached 2,000. the most recent deaths came this weekend. two americans killed when a fire fight broke out between u.s. forces and their afghan army allies. the afghan defense ministry said the battle was a result of a quote, misunderstanding between international forces and afghan soldiers. >> i think the signature attack that we're beginning to see is going to be the insider attack. >> this is something we have to discuss in detail, something that i feel a responsibility to correct. >> more than 50 international security assistants and four service members have been killed this year in attacks between u.s. forces and the afghan counterparts. an investigation is underway into the latest